December in Kaliningrad averages a daily high of 2.3°C with nights around -2.1°C. Expect roughly 17.2 wet days totalling 68.9mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Kaliningrad is May–September.
Based on KALININGRAD, RS (2.8km), 1995–2024. 24 years of December data.